Jan

Jan is a privacy-focused, open-source ChatGPT alternative that runs locally. It supports connecting to cloud providers like TensorX through OpenAI-compatible configuration.

Prerequisites

• Jan installed from jan.ai
• TensorX API key from app.tensorx.ai

Configuration

Step 1: Open Settings

1. Click the Settings icon (⚙️) in the bottom-left corner of Jan
2. Navigate to Model Providers in the left sidebar

Step 2: Configure OpenAI Provider

1. Select OpenAI from the Model Providers list
2. Enter your TensorX credentials:

   • API Key: Your TensorX API key
   • API Base URL: https://api.tensorx.ai/v1
3. Click Save

Step 3: Add TensorX Models

Jan automatically includes popular OpenAI models. To add specific TensorX models:

1. Go to Settings > Model Providers > OpenAI
2. Add models by their exact ID:

   • claude-sonnet-4-20250514
   • claude-3-5-sonnet-20241022
   • gpt-4o
   • gpt-4o-mini

Using Models in Chat

1. Open a new chat or existing thread
2. Click the model selector dropdown
3. Choose your configured TensorX model
4. Start chatting!

Manual Model Configuration

For advanced users, you can manually add models via JSON configuration:

1. Navigate to Jan Data Folder:

   • Mac: ~/Library/Application Support/jan/models/
   • Windows: %APPDATA%\jan\models\
   • Linux: ~/.config/jan/models/
2. Create a new folder for your model (e.g., tensorx-claude-sonnet)
3. Create a model.json file:

{
  "id": "claude-sonnet-4-20250514",
  "object": "model",
  "name": "Claude Sonnet 4 (TensorX)",
  "description": "Claude Sonnet 4 via TensorX API",
  "settings": {
    "ctx_len": 200000
  },
  "parameters": {
    "temperature": 0.7,
    "top_p": 0.95,
    "stream": true,
    "max_tokens": 4096
  },
  "metadata": {
    "author": "TensorX",
    "tags": ["Claude", "Anthropic", "TensorX"]
  },
  "engine": "openai"
}

Available Models

See TensorX Models for the complete list.

Recommended models for Jan:

Model	Best For
claude-sonnet-4-20250514	Complex tasks, analysis
claude-3-5-sonnet-20241022	General chat, coding
gpt-4o	Multi-modal, images
gpt-4o-mini	Fast, cost-effective

Troubleshooting

Model not connecting

1. Verify API key is entered correctly
2. Ensure base URL is https://api.tensorx.ai/v1 (with /v1)
3. Check Jan's logs for error details

Model unavailable

• Confirm the model ID matches exactly (case-sensitive)
• Verify your TensorX account has access to the model

Slow responses

• Check your internet connection
• Try a faster model like gpt-4o-mini

Resources

• Jan Documentation
• Jan GitHub
• TensorX API Reference